Air Better Than 2023, But All Not Well
New Delhi: With an average air quality index of 367 in the first fortnight, the month of Nov is recording higher pollution than two years ago. Though the average AQI in the period was lower than last year, it was higher than in 2022. The Central Pollution Control Board's data shows average AQI during Nov 1-15 was 376 in 2023 and 345 in 2022. During the first 15 days of the month this year, Delhi recorded 13 ‘very poor' air days and two ‘severe' days, including 12 consecutive ‘very poor' days when AQI surpassed 300 before ‘severe' readings on Nov 13 and 14. No ‘good' to ‘poor' days were seen in the fortnight. In comparison, the first fortnight of Nov last year had six ‘severe' days, six ‘very poor' days and three ‘poor' days. Anumita Roychowdhury, executive director, research and advocacy, Centre for Science and Environment, said, "This year, Diwali was before November. Even though stubble burning increased in this period, its contribution to PM2.5 was highly variable. Once again, this elevation in pollution points at the high influence of local pollution. We need to step up action against key sources of pollution." TOI had earlier reported that Nov 1-15 was the most polluted stretch in the year in Delhi since it coincides with peak stubble burning, Diwali firework use and an increase in traffic intensity around festivals. At this time, meteorological conditions, including slow wind, low temperature and inversion, also adversely impact dispersion of pollutants. This year, Diwali was observed on Oct 31, while the festival was celebrated on Nov 12 last year. The average AQI during Nov 1-15 from 2018 to 2023 is 371, according to a Delhi Pollution Control Committee analysis. Oct this year too was the most polluted in the past four years. CPCB's data shows that the city's average AQI of 231 in Oct this year was the highest since 2020, when it was 265. The figure was 219 last October, 210 in 2022 and 173 in 2021. In 2019, it was 234; 269 in 2018; 285 in 2017; 271 in 2016; and 264 in 2015. The air quality is likely to remain in the ‘very poor' category in Delhi for the next seven days, according to the Air Quality Early Warning System for Delhi, the forecasting body under the Union ministry of earth sciences.
